Characteristics of energy transfer of Pi 2 magnetic pulsations: Latitudinal dependence

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書誌事項

公開日
2000-06
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/1999gl010767
公開者
American Geophysical Union (AGU)

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説明

<jats:p>To investigate the generation and propagation mechanisms of Pi 2 magnetic pulsations, we have analyzed magnetic field data from the 210° magnetic meridian (MM) stations. We used 50 Pi 2 events that were simultaneously observed at seven stations along the 210° MM during January 1995, and focused our analysis on associated magnetic energy, ((Δ<jats:italic>H</jats:italic>)²+(Δ<jats:italic>D</jats:italic>)²)/µ<jats:sub>0</jats:sub>. The times when the amplitude of the magnetic energy attained the maximum (<jats:italic>T<jats:sub>max</jats:sub></jats:italic>) were compared among these stations. We found that <jats:italic>T<jats:sub>max</jats:sub></jats:italic> has a latitudinal dependence, especially at higher latitudes, which has not been previously reported. At Kotel'nyy (L=8.50) on the poleward side of the auroral region, <jats:italic>T<jats:sub>max</jats:sub></jats:italic> occurred an average of 21 seconds earlier than <jats:italic>T<jats:sub>max</jats:sub></jats:italic> at Guam (L=1.01), and often as much as one minute earlier. The existence of latitudinal variation has implications for interpretation of issues related to timing of substorm onset; it is necessary to consider the global features of Pi 2 events in the study of auroral and magnetospheric substorms.</jats:p>

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